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Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill by Reportable Segment (Parenthetical) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill | $ 1,198,600,000 |  |  | $ 1,198,600,000 |  | $ 1,260,100,000
Goodwill impairment charges | 0 |  |  | 66,800,000 | $ 64,000,000.0 |
Jefferson Wells |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill | 55,500,000 |  |  | 55,500,000 |  |
Right Management |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill | 62,100,000 |  |  | 62,100,000 |  |
Germany |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill impairment charges |  | $ 66,800,000 | $ 60,200,000 |  |  |
Americas | United States |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill | 490,200,000 |  |  | 490,200,000 |  | 490,300,000
Americas | United States | Jefferson Wells |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill | 545,700,000 |  |  | 545,700,000 |  | 545,800,000
Southern Europe | France |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill | 70,300,000 |  |  | 70,300,000 |  | 67,300,000
Southern Europe | Italy |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill | $ 4,000,000.0 |  |  | $ 4,000,000.0 |  | $ 4,600,000

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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